The normal position of these signals is clear, but if the wires connecting them are broken by a fall of stone, the signals will go to danger.

If the signals are at danger, the driver must reduce speed and proceed cautiously, sending his fireman forward to ascertain if the line is clear.

The signal lamps are attended to by the District Engineer's staff.

Bell and telephone communication is provided between the ganger's house at Craig-na-Cailleach and the station master's house at Strathyre for the purpose of enabling them to communicate in the event of a fall of rock on the line.